I don't really like the Mac Studio. It's mainly because it's not easy to open and it doesn't have multiple NVMe ports that can be swapped out. For me, it's not a workstation.
Unified memory, okay; AI on a large amount of RAM, okay; I can see people saying that a Mac Studio can compete with the Nvidia DGX or an RTX 6000 Blackwell 96GB, but for me, that's not how it works.
A workstation is a motherboard, a chipset, and a processor with a lot of PCIe lanes. I'm repeating myself a bit, but that's what it's about. PCIe lanes and PCIe slots. Trying to route everything through Thunderbolt and external enclosures isn't a good solution for me. I prefer a solution is a case with a large power supply that powers everything inside, and cards that can be swapped out depending on the task. So, PCIe cards with NVMe drives, Ethernet cards, graphics cards, cards for musicians, and so on...
Indeed, if we can have a case with two M5 Ultra motherboards to create an internal cluster powered by a single power supply and driving multiple NVMe slots, we can imagine a new type of machine. That's becoming interesting, but I'd be more inclined to want a macOS that remains open to Intel (and AMD) and accepts AMD and Nvidia drivers.